US PATENT SUBCLASS 152 / 209.3
.~.~.~.~ Having varying tread characteristic (e.g., groove depth, groove angle, etc.) other than design cycle

Current as of: June, 1999
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152 /   HD   RESILIENT TIRES AND WHEELS

151  DF  TIRES, RESILIENT {14}
208  DF  .~ Anti-skid devices {8}
209.1  DF  .~.~ Tread {13}
209.2  DF  .~.~.~ For controlling noise by varying design cycle (e.g., specified pitch ratio, pitch sequence, etc.) {1}
209.3.~.~.~.~ Having varying tread characteristic (e.g., groove depth, groove angle, etc.) other than design cycle

DEFINITION

Classification: 152/209.3

Having varying tread characteristic (e.g., groove depth, groove angle, etc.) other than design cycle

(under subclass 209.3) Tread having a tread characteristic varying in proportion to pitch.